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Dusky dolphin (Lagenorhynchus obscurus) feeding tactics and multi-species associations

Citation

Vaughn, RL and Shelton, DE and Watson, LA and Wursig, B, Dusky dolphin (Lagenorhynchus obscurus) feeding tactics and multi-species associations, New Zealand Journal of Marine and Freshwater Research, 41, (4) pp. 391-400. ISSN 0028-8330 (2007) [Refereed Article]

Copyright Statement

The Royal Society of New Zealand 2007

DOI: doi:10.1080/00288330709509929

Abstract

In this study, monthly changes in dusky dolphin (Lagenorhynchus obscurus) feeding tactics and multi‐species associations in Admiralty Bay and Current Basin, New Zealand were described from August to November 2005 and from May through August 2006. Concurrent changes in dusky dolphin abundance, prey characteristics, and locations of feeding bouts were examined. Data were collected during systematic surveys and focal follows of dolphin groups. During 335 dolphin feeding bouts (52 observed underwater), data were recorded on number of associated fur seal (Arctocephalus forsteri), seabirds, and sharks; dolphin behaviour; prey ball parameters; and locations. Dolphin feeding tactics, multi‐species associations, and locations of feeding bouts were different from May through July than from August to November. From May through July, dolphins fed on mobile prey at depth; from August to November, they herded small schools of fish (including pilchard Sardinops neopilchardus) to the surface. Primarily shearwaters (Puffinus spp.) fed with dolphins from May through July; shearwaters, gannet (Morus serrator), gulls (Larus spp.), and fur seal frequently fed with dolphins from August to November. These intra‐annual differences suggest that changes in prey species or behaviour influence dolphin feeding tactics, and influence which species benefit from feeding with dolphins.

Item Details

Item Type:Refereed Article
Keywords:Arctocephalus forsteri, feeding behaviour, foraging ecology, mixed species aggregations, seabirds, sharks
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Watson, LA (Dr Leslie Watson)
ID Code:121222
Year Published:2007
Web of Science® Times Cited:33
Deposited By:Directorate
Deposited On:2017-09-18
Last Modified:2017-12-01
Downloads:0

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